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Types and Programming Languages by Benjamin C < Free Open Study > . .Types and Programming Languages by Benjamin C. Pierce ISBN:0262162091 The MIT Press © 2002 (623 pages) This thorough type-systems reference examines theory, pragmatics, implementation, and more Table of Contents Types and Programming Languages Preface Chapter 1 - Introduction Chapter 2 - Mathematical Preliminaries Part I - Untyped Systems Chapter 3 - Untyped Arithmetic Expressions Chapter 4 - An ML Implementation of Arithmetic Expressions Chapter 5 - The Untyped Lambda-Calculus Chapter 6 - Nameless Representation of Terms Chapter 7 - An ML Implementation of the Lambda-Calculus Part II - Simple Types Chapter 8 - Typed Arithmetic Expressions Chapter 9 - Simply Typed Lambda-Calculus Chapter 10 - An ML Implementation of Simple Types Chapter 11 - Simple Extensions Chapter 12 - Normalization Chapter 13 - References Chapter 14 - Exceptions Part III - Subtyping Chapter 15 - Subtyping Chapter 16 - Metatheory of Subtyping Chapter 17 - An ML Implementation of Subtyping Chapter 18 - Case Study: Imperative Objects Chapter 19 - Case Study: Featherweight Java Part IV - Recursive Types Chapter 20 - Recursive Types Chapter 21 - Metatheory of Recursive Types Part V - Polymorphism Chapter 22 - Type Reconstruction Chapter 23 - Universal Types Chapter 24 - Existential Types Chapter 25 - An ML Implementation of System F Chapter 26 - Bounded Quantification Chapter 27 - Case Study: Imperative Objects, Redux Chapter 28 - Metatheory of Bounded Quantification Part VI - Higher-Order Systems Chapter 29 - Type Operators and Kinding Chapter 30 - Higher-Order Polymorphism Chapter 31 - Higher-Order Subtyping Chapter 32 - Case Study: Purely Functional Objects Part VII - Appendices Appendix A - Solutions to Selected Exercises Appendix B - Notational Conventions References Index List of Figures < Free Open Study > < Free Open Study > Back Cover A type system is a syntactic method for automatically checking the absence of certain erroneous behaviors by classifying program phrases according to the kinds of values they compute. The study of type systems--and of programming languages from a type-theoretic perspective--has important applications in software engineering, language design, high-performance compilers, and security. This text provides a comprehensive introduction both to type systems in computer science and to the basic theory of programming languages. The approach is pragmatic and operational; each new concept is motivated by programming examples and the more theoretical sections are driven by the needs of implementations. Each chapter is accompanied by numerous exercises and solutions, as well as a running implementation, available via the Web. Dependencies between chapters are explicity identified, allowing readers to choose a variety of paths through the material. About the Author Benjamin C. Pierce is Associate Professor of Computer and Information Science at the University of Pennsylvania. < Free Open Study > < Free Open Study > Types and Programming Languages Benjamin C. Pierce The MIT Press Cambridge, Massachusetts London, England Copyright © 2002 Benjamin C. Pierce All rights reserved. No part of this book may be reproduced in any form by any electronic of mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher. This book was set in Lucida Bright by the author using the document preparation system. Printed and bound in the United States of America. Library of Congress Cataloging-in-Publication Data Pierce, Benjamin C. Types and programming languages / Benjamin C. Pierce p. cm. Includes bibliographical references and index. ISBN 0-262-16209-1 (hc.:alk. paper) 1. Programming languages (Electronic computers). I. Title. QA76.7 .P54 2002 005.13—dc21 2001044428 < Free Open Study > < Free Open Study > Preface The study of type systems—and of programming languages from a type-theoretic perspective—has become an energetic field with major applications in software engineering, language design, high-performance compiler implementation, and security. This text offers a comprehensive introduction to the fundamental definitions, results, and techniques in the area. Audience The book addresses two main audiences: graduate students and researchers specializing in programming languages and type theory, and graduate students and mature undergraduates from all areas of computer science who want an introduction to key concepts in the theory of programming languages. For the former group, the book supplies a thorough tour of the field, with sufficient depth to proceed directly to the research literature. For the latter, it provides extensive introductory material and a wealth of examples, exercises, and case studies. It can serve as the main text for both introductory graduate-level courses and advanced seminars in programming languages. < Free Open Study > < Free Open Study > Goals A primary aim is coverage of core topics, including basic operational semantics and associated proof techniques, the untyped lambda-calculus, simple type systems, universal and existential polymorphism, type reconstruction, subtyping, bounded quantification, recursive types, and type operators, with shorter discussions of numerous other topics. A second main goal is pragmatism. The book concentrates on the use of type systems in programming languages, at the expense of some topics (such as denotational semantics) that probably would be included in a more mathematical text on typed lambda-calculi. The underlying computational substrate is a call-by-value lambda-calculus, which matches most present-day programming languages and extends easily to imperative constructs such as references and exceptions. For each language feature, the main concerns are the practical motivations for considering this feature, the techniques needed to prove safety of languages that include it, and the implementation issues that it raises—in particular, the design and analysis of typechecking algorithms. A further goal is respect for the diversity of the field; the book covers numerous individual topics and several well-understood combinations but does not attempt to bring everything together into a single unified system. Unified presentations have been given for some subsets of the topics—for example, many varieties of "arrow types" can be elegantly and compactly treated in the uniform notation of pure type systems—but the field as a whole is still growing too rapidly to be fully systematized. The book is designed for ease of use, both in courses and for self-study. Full solutions are provided for most of the exercises. Core definitions are organized into self-contained figures for easy reference. Dependencies between concepts and systems are made as explicit as possible. The text is supplemented with an extensive bibliography and index. A final organizing principle is honesty. All the systems discussed in the book (except a few that are only mentioned in passing) are implemented. Each chapter is accompanied by a typechecker and interpreter that are used to check the examples mechanically. These implementations are available from the book's web site and can be used for programming exercises, experimenting with extensions, and larger class projects. To achieve these goals, some other desirable properties have necessarily been sacrificed. The most important of these is completeness of coverage. Surveying the whole area of programming languages and type systems is probably impossible in one book—certainly in a textbook. The focus here is on careful development of core concepts; numerous pointers to the research literature are supplied as starting points for further study. A second non-goal is the practical efficiency of the typechecking algorithms: this is not a book on industrial-strength compiler or typechecker implementation. < Free Open Study > < Free Open Study > Structure Part I of the book discusses untyped systems. Basic concepts of abstract syntax, inductive definitions and proofs, inference rules, and operational semantics are introduced first in the setting of a very simple language of numbers and booleans, then repeated for the untyped lambda-calculus. Part II covers the simply typed lambda-calculus and a variety of basic language features such as products, sums, records, variants, references, and exceptions. A pre liminary chapter on typed arithmetic expressions provides a gentle introduction to the key idea of type safety. An optional chapter develops a proof of normalization for the simply typed lambda-calculus using Tait's method. Part III addresses the fundamental mechanism of subtyping; it includes a detailed discussion of metatheory and two extended case studies. Part IV covers recursive types, in both the simple iso-recursive and the trickier equi-recursive formulations. The second of the two chapters in this part develops the metatheory of a system with equi-recursive types and subtyping in the mathematical framework of coinduction. Part V takes up polymorphism, with chapters on ML-style type reconstruction, the more powerful impredicative polymorphism of System F, existential quantification and its connections with abstract data types, and the combination of polymorphism and subtyping in systems with bounded quantification. Part VI deals with type operators. One chapter covers basic concepts; the next develops System Fω and its metatheory; the next combines type operators and bounded quantification to yield System ; the final chapter is a closing case study. The major dependencies
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